Motor having speed reducer and control circuit

Abstract

A motor has a motor unit, an output shaft, a speed-reducing unit for controlling the motor unit, a control circuit board and a gear housing. The speed-reducing unit transmits a rotation of the rotation shaft of the motor unit to the output shaft to rotate slower than the rotation shaft. The gear housing is fixed to the motor unit and includes a generally flat shaped speed-reducing unit receiving portion, which installs at least a part of the speed-reducing unit therein, and a generally flat shaped circuit board receiving portion, which installs the control circuit board therein. The output shaft protrudes beyond and perpendicularly to a side face of the speed-reducing unit receiving portion. The circuit board receiving portion is inclined to the speed-reducing unit receiving portion around a center axis of the rotation shaft to be retracted from an output shaft side of the speed-reducing unit receiving portion.

1. A motor comprising:
 a motor unit having a rotation shaft; 
 an output shaft that is rotated by the motor unit; 
 a speed-reducing unit that reduces a speed of rotation supplied from the rotation shaft and transmits the rotation to the output shaft; 
 a control circuit board that controls the rotation of the rotation shaft; and 
 a gear housing fixed to the motor unit, wherein: 
 the gear housing includes a generally flat shaped speed-reducing unit receiving portion and a generally flat shaped circuit board receiving portion; 
 the speed-reducing unit receiving portion receives at least a part of the speed-reducing unit; 
 the output shaft extends outward beyond a side face of the speed-reducing unit receiving portion; 
 the circuit board receiving portion receives the control circuit board; 
 each of the speed-reducing unit receiving portion and the circuit board receiving portion radially extends from a center axis of the rotation shaft; 
 a first fictive plane, which is associated with the generally flat shape of the circuit board receiving portions, is tilted away from a second fictive plane, which is generally parallel to the center axis of the rotation shaft and is generally perpendicular to an axis of the output shaft at a leading end of the output shaft; and 
 a distance, which is measured between the first fictive plane and the second fictive plane in a direction parallel to the axis of the output shaft, increases in a direction radially away from the axis of the output shaft. 
 
   
   
     2. The motor according to  claim 1 , wherein the speed-reducing unit receiving portion and the circuit board receiving portion are connected with each other at a connection portion disposing the center axis of the rotation shaft therein. 
   
   
     3. The motor according to  claim 1 , wherein the control circuit board is installed generally in parallel with the circuit board receiving portion. 
   
   
     4. The motor according to  claim 1 , wherein the control circuit board has an external connection terminal disposed generally perpendicular to the control circuit board receiving portion. 
   
   
     5. The motor according to  claim 1 , wherein the gear housing is made of a resinous material to integrate the speed-reducing unit receiving portion and the circuit board receiving portion. 
   
   
     6. The motor according to  claim 1 , wherein the circuit board receiving portion has an insertion hole through which the control circuit board is installed therein. 
   
   
     7. The motor according to  claim 6 , wherein the insertion hole opens on a peripheral face of the circuit board receiving portion so that the control circuit board is inserted therethrough in a direction generally in parallel with the circuit board receiving portion. 
   
   
     8. The motor according to  claim 1 , wherein the control circuit board has an extending portion disposing a rotation sensor thereon for detecting a rotational speed of the rotation shaft. 
   
   
     9. The motor according to  claim 8 , wherein the rotation sensor is a pair of Hall elements. 
   
   
     10. The motor according to  claim 1 , wherein:
 a plane of the control circuit board is tilted away from the second fictive plane; and 
 a distance, which is measured between the plane of the control circuit board and the second fictive plane in the direction parallel to the axis of the output shaft, increases in a direction radially away from the axis of the output shaft. 
 
   
   
     11. A motor for driving a regulator of a power window system installed in a vehicular door, the motor comprising:
 a motor unit having a rotation shaft; 
 an output shaft that is rotated by the motor unit to drive the regulator; 
 a speed-reducing unit that reduces a speed of rotation supplied from the rotation shaft and transmits the rotation to the output shaft; 
 a control circuit board that controls the rotation of the rotation shaft; and 
 a gear housing fixed to the motor unit, wherein; 
 the gear housing includes a generally flat shaped speed-reducing unit receiving portion and a generally flat shaped circuit board receiving portion; 
 the speed-reducing unit receiving portion receives at least a part of the speed-reducing unit; 
 the circuit board receiving portion receives the control circuit board; 
 each of the speed-reducing unit receiving portion and the circuit board receiving portion extends from a center axis of the rotation shaft; 
 the speed-reducing unit receiving portion is disposed generally in parallel with a generally planar portion of the regulator, which extends generally perpendicular to an axis of the output shaft and is opposed to the circuit board receiving portion in a direction parallel to the axis of the output shaft; 
 the circuit board receiving portion is tilted away from the generally planar portion of the regulator; and 
 a distance, which is measured between the circuit board receiving portion and a plane of the generally planar portion of the regulator in the direction parallel to the axis of the output shaft, increases in a direction radially away from the axis of the output shaft. 
 
   
   
     12. A motor comprising:
 a motor unit having a rotation shaft; 
 an output shaft that is rotated by the motor unit; 
 a speed-reducing unit that reduces a speed of rotation supplied from the rotation shaft and transmits the rotation to the output shaft; 
 a control circuit that controls the rotation of the rotation shaft; and 
 a gear housing fixed to the motor unit, wherein the gear housing includes a generally flat shaped speed-reducing unit receiving portion and a generally flat shaped circuit board receiving portion; 
 the speed-reducing unit receiving portion receives at least a part of the speed-reducing unit; 
 the output shaft extends outward beyond to one side face of the speed-reducing unit receiving portion in a direction generally perpendicular to the one side face of the speed-reducing unit receiving portion; 
 the circuit board receiving portion receives the control circuit board; 
 each of the speed-reducing unit receiving portion and the circuit board receiving portion radially extends from a center axis of the rotation shaft; 
 a side face of the circuit board receiving portion which is on the same side as the one side face of the speed reducing unit receiving portion, is tilted away from a fictive plane, which is generally parallel to the center axis of the rotation shaft and is generally perpendicular to an axis of the output shaft at a leading end of the output shaft; and 
 a distance, which is measured between the side face of the circuit board receiving portion and the fictive plane in a direction parallel to the axis of the output shaft, increases in a direction radially away from the axis of the output shaft. 
 
   
   
     13. A motor for driving a regulator of a power window system installed in a vehicular door, the motor comprising:
 a motor unit having a rotation shaft; 
 an output shaft that is rotated by the motor unit to drive the regulator; 
 a speed-reducing unit that reduces a speed of rotation supplied from the rotation shaft and transmits the rotation to the output shaft; 
 a control circuit board that controls the rotation of the rotation shaft; and 
 a gear housing fixed to the motor unit, wherein; 
 the gear housing includes a generally flat shaped speed-reducing unit receiving portion and a generally flat shaped circuit board receiving portion; 
 the speed-reducing unit receiving portion receives at least a part of the speed-reducing unit; 
 the circuit board receiving portion receives the control circuit board; 
 each of the speed-reducing unit receiving portion and the circuit board receiving portion radially extends from a center axis of the rotation shaft; 
 the speed-reducing unit receiving portion is disposed generally in parallel with a generally planar portion of the regulator, which extends generally perpendicular to an axis of the output shaft and is opposed to a side face of the circuit board receiving portion in a direction parallel to the axis of the output shaft; 
 the side face of the circuit board receiving portion is tilted away from the generally planar portion of the regulator; and 
 a distance, which is measured between the side face of the circuit board receiving portion and a plane of the generally planar portion of the regulator in the direction parallel to the axis of the output shaft, increases in a direction radially away from the axis of the output shaft.